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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2258fad4ac393d82757e7a8d9a5d6c55c69d28a2ce5cf21e876730d965fff8aa' 
  AND token = 'qvnFo79pfT6oCkMaUP6qQib2wUosf6QadgAKuRZeJ5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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