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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b368c90081cd59f7e56445227e404ae23f344b08e960aff5c1b0d2e4334cc7' 
  AND token = 'Mmyb5EYCIyHTjuBbRcLLyCDuTGGAT12KrTS4WhPB9lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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