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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6400c1bb1a51ce3b63980b82f9b46479b51e9f1cdfc7fbff99142a8bf9c4422c' 
  AND token = 'nyxNTi9MXORGW5b801Jjs/E7KdUC87f1CajG8gISfRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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