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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73dcf1b8b6856b18ec47d70a176a87a2e101a5b948f0682df09995a84ee66cc0' 
  AND token = 'ih7/7B+0nC41jarwGQ6KtCb2B5DcQwLXEl83AAY6Kys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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