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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d0ec5fb47d5bf4a2ff38b3327e1493255f8c522737f8e37fc50ccc7bd93230' 
  AND token = 'X4WE2eLRa5BqhZj4N7gNqw7ADCTYziVukfzva0Xa3PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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