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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89c5f4e61b6a5ebab8476795bed0d245d6b7d36de42051437ce4c3d56302855' 
  AND token = 'abNwzbLaUO6SiI5lZ0P+MJ+HdFUWOasBZ234atQbFqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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