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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5046402acbb40d644f0de06179f2dbcace50bdc054a039b34f993b353013d1aa' 
  AND token = 'VVGS0Ngnb4RVmoP8wV94EJVot/4WgGy7hsl69ZlW/rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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