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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9811d857edca5468356f5820b716fb0343ca87ccf9a1d6ba95bc9996c0cd63f2' 
  AND token = 'tblNQa7OEtV+jCAHvwntbkTXWWdRtKwoXoh4RNeUKMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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