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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12be00f2e47e9aa0da992d5e5b3386b4f9a5551806e555d64e8ff86d38046d3' 
  AND token = 'KAWSJsv6D/Bwq/9MOsaoMgWGFN8Lcu/PJ9DPVNcApmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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