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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99a58dc33e30a660648069936cc55e3cfba68c728335d5cda9dc7d92503decf' 
  AND token = '0oA1rteMOj3mkDhyCpTPlDgoTDTDsW25FVXCDzYANCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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