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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7eae05407e7d6c133ff36f9ab213beb81742cfc854d6ca6cba6b4b2dce3ad8' 
  AND token = 'mOeQXAM67Mgjg9e6zk+zwWTxoPdQWumTDWyh1GZ9Rv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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