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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344035a95e5bf7661d095520f1dbb00c7908d690e6938b99a6839dcd0fe07bc8' 
  AND token = 'Z5plDHfS5JKhzNcSWn9BPAogTR3d/EEuIyEA/A7o7n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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