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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d6e10edb059406001e415bde26b9c38c1427397f3724c83dcc2d93861bc44e' 
  AND token = 'kYA60RM8TLDkallr/HUObmRM2LEUS1hJN6IVw2yjQa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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