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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383d4ef6067a92a9292c6af74b827708881829279683332befa76d957cc14e68' 
  AND token = 'tJ0RORu3+dMrw5GiPkds7L86YU2KaVd0TE5S4e9ez/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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