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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593171a2d606f766fe1a3582252491ce0aa48f0bd82e10f87950c23936aeddb7' 
  AND token = 'itQ+D81OR7g7WAoaK0TT4VhV13qhYXaOO0Pf6/4vtSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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