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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9f19830366f77f13df741095774552e3bb543574c1be1f39f51de2c147c4f6' 
  AND token = 'LZm4l2aKCnBb5wkbCl1xaLfZX4szlgrMjTuuCvFIeEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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