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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7bf015789d0bf525456019bc0501ca8b349f95309ae8e25318616794e6d83c' 
  AND token = 'pKF9X3s1lWRkdr0QwiWlQL8/na3HGn3U/A7wPOEHqT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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