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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f583199418eea99d52246a687ff2efd57ccaf34bb34322cc9e2172e370a16f49' 
  AND token = 'Oi1myEhNnABfGxO4quGBMjYF9Nl99I2U1lBtEeBIEMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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