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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae1dc0774115c876095d0e0d974d717bb5114b01f820ef838179fa254884a46' 
  AND token = 'yO0bol+1sx2VtKd+gTLttxXylz3sE4XMzogI8JR9yAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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