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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32f44cd0266dd65f4ee7165c502a7ba389a0f1356e95346d69635eea3acfe00' 
  AND token = 'WvDTshYgKqq13kawlBeAumMOosDxkns9dCvFNpLGDu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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