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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d38463e82f1f13cac96639ef4c512ba545ca5f10102682149b58b36b199f0d' 
  AND token = 'c6XyZwckudXeq9J+EG5M3anKQUWI89GjajnX0TH89Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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