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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3990b46a694e74e1de45180a3139b01cba94a44f05094a2c52b72fb991625346' 
  AND token = 'cI7ED+DsqKv+lARzbgb/pBhUkGkz4yiYc+lz74OYLqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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