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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb71d481990c7ddbdce0db5c4d05b50588ed8772c82400ece3a96a5e9284b4d0' 
  AND token = 'PiNEFS1pM+tS0phSzQLTEqvgooF8IsfnPg6sggs9WJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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