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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e07029fa3e2ea028976ba2541984ec89a4021518f127068aeb1e6148d625f99' 
  AND token = 'eXI1/d/FkNENox93l7z8MZbo5XhxKd/Izz9nqomJcII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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