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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb22b0110fb2ab394cfbc686ceb31380e522eaaae96a164c9f0ff697630c9d6' 
  AND token = 'NumyxsNNvXIqub64aNTpxmNdYlw1EuPZpkZWeR24kvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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