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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b15cd8f8aea2af7be26e73d88e9191dce81648001a30fa924ca62b52926c7e5' 
  AND token = '1/5EgVnvlperxltcHGovSHokEG06KG4NBJGXAkTOmBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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