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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7beb614be12476e66051b3822dd5c754fd56e4eb79f1d8d80662e4e4554f1f41' 
  AND token = 'xqK5O59xYUbIyJ9vR15Y6bU7n3FnwddnzaZd+1NQmNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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