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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d64ee538e2e9b71b0fcf87a190f25b2273b6677ff8266c831d1873aac810db1' 
  AND token = '1ONhvkjqeCySQYG1fx8Qu05r6SPN/oUb3O+lN4JVtJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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