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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46be1318b86b87e2150889d9621e0b4f68944928a513651efa30e17a946b9f0' 
  AND token = 'e32P6mUwjK9lg191U2kzMC3nkFHZMFE9ne7wPwjfhQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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