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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2187bfb3a941b0f924e4acac1ffd558178394f33ad0c68de44de28482f2fa220' 
  AND token = 'xH+wyLkUMDCN6E6nvEuhGsgQNVY6sonAysbOG8fYc1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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