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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcd2ff1cb81d9f0c3916f0db40cdcc8137c6ca64e0713b49fdfd8ab2223e997' 
  AND token = '+cJi1iRtUTCsFkqjrYwoWwlqPFp6XOZ+AKCTKUcH6Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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