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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588c436336f29242ceb6e8e87a50f1cc9147a9fb4f7babf3125714f9ecd544f6' 
  AND token = '7BSnBwdJmSg9tUa/BnBaGiik/kTARYTtBzxM3GzWSGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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