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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6ce73348da31401ae9315fd9a826f12c493296abfed83e3d76411d173c7372' 
  AND token = '5eX70LT0wHpFgzF01xPrSjaU+aFOUym59/B+uQ0Mwco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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