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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fdde1ddfab20330b20bf200182d314255079136b6ea013de45342ab3ead320' 
  AND token = 'EsxGHbPgZhzD5xu3oWqsl1RsXiApyqi+Z0SOMwmcdE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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