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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4e3198cd45919d686a86ec090190846b44171e6c12decbade7a4bb7dd5144a' 
  AND token = 'XssWIsS0lkDYkWrDRiJfGTMW96PKcRW/pQLxx4XK0zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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