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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0209e2949517dfbfa8445d5ac0e60b52a5adaeec1cae0773d8ace4ee4920da7f' 
  AND token = 'uxQytXGx9j/sdm20AsPqI06YfSsoNepCxn6KPMP/k2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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