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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cadbbfa3b47cbd521356085b72299c4d88c3a2ab953331ae8c4696963545b7' 
  AND token = 'OlWQkEeoL7L+7kWl0sekXmAYC/kjZorJL5j3mezwbN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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