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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0de999ee66db426daa3b2318f3edd804b5e0b300b465a01a510803d3ce4e95' 
  AND token = 'vGeZn6l9OHfLzMI5NQ51oSFkOt4vvh1TcYWd4RkDuqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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