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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31691c14c555725947fa5615ed431b7fb5e504014c2b792a026c34fac6d50f50' 
  AND token = 'GPNW55j25EgJ2omm5La37mmT47CXHA4nMeQEE9Zgx1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}