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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b480d6043e3daec2161c08bd767d748f80fb1e1300484da3f1e70e45f9600a55' 
  AND token = '6/qRbcntWs0rSJH4TRYRAZys+phQ+J+VygvsPyc2yd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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