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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b153811a4916c526762ecf95b5c78c6ac1fe9edb3d8592df01b95f27169370' 
  AND token = 'UjsbEkCFTjnkQzY3cEHAi2ddeH86ZY2nOwDsF7dk/hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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