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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6076e254cb4e54b9a57da487121769268e3d30fa87f9ac943e7fe3bf78d688' 
  AND token = 'A76SsRqHwdaxXNpw0oqaFr9aLriS4pxoXbNjrSeLhYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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