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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963fce6d5036bc5671ca7538a5c45a2a4224b599180c0320b70d7c9ef71cfebc' 
  AND token = 'qvlx4siVI0gwBEYYmi8CtT6Tak101QswdhaVFlCWFeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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