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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be80ffaa28ff25087f45b358fd106155634509a8c594d18993890d434c26552' 
  AND token = 'e4hr7dnabMtxlM9Umxlg952+4/MQZJK+r/hBeZcwkSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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