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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8efcbee667c72d66270f4484054d5b5637b06a93b26caa89053c3bf00d03e24' 
  AND token = 'MVY8n9AD4j2WHqaLZ8JLYGdlkwchLmKVHyPPNRuiWHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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