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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc31835b921e2c8d1718608bb3349045dfd6b76fb132c4f01cf5b1a77bb7b6db' 
  AND token = 'WqM4LODYIDGl4PP+WAu853V6B0ZJW1kLakNCOlCrud8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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