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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc75c7e117c993ce3719f19344f16698c26f3f946a451f3a507e13e1e0fc2fe' 
  AND token = 'JZhUowrB3qcxvYNnhrmtXB7obwGM63Kg89dby1OqOCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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