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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52f768eacd6f388f28e04e7b68c99dc194c1d020401131d84ebfab3147310b9' 
  AND token = '8OOYm/1Gs1aVvARF4JBl9PkqO5dqs0waEihewPXa8aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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