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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9db9f5b685be98e53454959f99bee5de91cf9696eddf454d103399e39bb7a47' 
  AND token = 'jtxDhcHGf4Fks3yyqkQkAyP7mYHVn7J7XJwO8hCwp2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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