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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abffd393d758d3ec41043b95dd40592cc824f7b43d292d0a455b9bf768200489' 
  AND token = 'A0yMaSlU9708jw++up3XSjR5ivYpdllJ2rlQRTjZR5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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