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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc7831f4c7d5cde1bf27e9764daeaa7ba99fe78dd339bcb5ca4c7da0f47315c' 
  AND token = 'rcUDEda7TkIFQpoyIFz6xGKN6L1OKmr3gyL+rWx+F6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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