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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c1b6d3008e02be21e56066a69e2a40a52a651b12a4dd68a582c6f31f83373b' 
  AND token = 'GYoUqJAZ3SaPAztf228ufpmTefks+RLbNYObcHqUke8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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