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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cbe83d48756425342f5f0873dd8bcfcda9b64f479c5ab335d07e56d5044a3f' 
  AND token = 'J4u7nH8LBolKL8Ktay4B+dx6h2bb778GBKPBYalPxyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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