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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71907c3f7093350fa45d9853a5a79a3a4bbcc30f39567b2783b2de0e083f70dc' 
  AND token = 'opqV2CKR20hvVLxr73zgRApC7BKfFN5zPsj7r8d/kDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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