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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50dce98438acbb13553902a670c11cbdd17caed5e84a29853ccac7eb63f96caa' 
  AND token = 'Mq4UQn4qqb7cqJzWoe6nMjy5iDLjVToGnAhSsKpGeuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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