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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f2632d63659f5b6279efa8bc1acb606d24fe81f76efb06fa34bd6e5c41328d' 
  AND token = 'K286lH03AHd3P19UC5FLaHKrsA07VFZGB2fUqZTaL+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.07795

JSON explain

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