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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c62e3e302f9b86af8609051ac9650a75a79371cc11471fd3945916d8c0fe794' 
  AND token = 'fQ7e6dqDwPx7Qu5W7/AMFv1nR2SlfAFmQEb9QWgRyKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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