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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38230bb5b46948ee8e8bf6bda0b676511d5ab0dd64ad52b62ac73fe695be2ff5' 
  AND token = 'Ly+5nPgbViONn8Yc3UPjDMRrofKjAnvvMPmibc58awM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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