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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c8f46e3b1e5b5ed515ff94078d221f28dee17ad2741a8eb7f3c924bf707c19' 
  AND token = 'e1hfR3WKFdNir2jmwjjVZeJl2DL56YM5sjk0mcz0AQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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