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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d69f21ccee8fdc6eb3fc05425af258996f1a55d2c1f51ae68e552453f7baf39' 
  AND token = 'Y8YggXDk+urnMFaC+q7R0HczKIQ++7d2FzX0vmgWfP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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