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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630b4b8a123fec28398a15ae794b3181c13fc0374fa54c85b328ee61c55926b9' 
  AND token = '11u9LdPK/4fBD1hxtzFbgpcSzon3vECrvO5myYWghgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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