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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5eb83be9be6fb84d856292f15e9464fe92c8ce9b67bda5a0802df576b85904' 
  AND token = '7JtgNBPOi9EptfKShPo8zn7rG6zgcG8DEKiN9AVfTrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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