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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8b4fefacc680238901ea465fc892aa552cdb4b8a14827bd57af5b54b50226f' 
  AND token = 'jb6rzu6LiYDoElIJxR9E/2ktysbQjKV1/x8cmWlqnjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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