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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a18f164b864936e5f3ef9bb62adc7971bea6b0271604ce24383f984bec24e3' 
  AND token = 'dGhVY7/X0jTa7/8Tc9VsricxfuURDSIV9Xd5gv5PY6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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