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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b77e8e056ba9e1bddc9f7c510e247955a2282b77f6847659be6a94f632bc28a' 
  AND token = 'p9sXkJhh1xpsIJCBwuKZHeOoDa1ymBUyAxj8Syb76JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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