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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06e77fd332459e916593e3651d9658086ac7df3ef02d975f7486aa14321a9f6' 
  AND token = '/xN9aTUWAFMRCBZy+lDRsgV6GY0mkTFhkNUYrM9yED8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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