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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ba61646435aeaa33f92c69977d1d6519d72ab0131e43495f7a4699c7b8e141' 
  AND token = 'YNpjPeOle6VxWCz9xano4xr84FN9/n+LpWAUCmh8NBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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