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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f1741f2b8a8b1c76a5d0aaa07cf69842cb18f2a77903f1c50bb5be93260b98' 
  AND token = '4lfKVedawiFa8b4NGa5iYB6PeoUABY4C7AWFdeVYG+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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